math/mpc: Update to version 1.3.1

Update to MPC version 1.3.1 with the following changes:
 - New function: mpc_agm
 - New rounding modes "away from zero", indicated by the letter "A"
   and corresponding to MPFR_RNDA on the designated real or imaginary part.
 - New experimental ball arithmetic.
 - New experimental function: mpc_eta_fund
 - Bug fixes:
   . mpc_asin for asin(z) with small |Re(z)| and tiny |Im(z)|
   . mpc_pow_fr: sign of zero part of result when the base has up to
     sign the same real and imaginary part, and the exponent is an even
     positive integer
   . mpc_fma: the returned int value was incorrect in some cases
     (indicating whether the rounded real/imaginary parts were
     smaller/equal/greater than the exact values), but the computed
     complex value was correct.

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